Platen for type-writing machines.



W. R. MULOCK.

PLATEN FOR TYPE WRITING MACHINE S.

APPLICATION FILED nma zs, I915.

1,156,614. I Patented. Oct. 12, 1915.

are

WILLIAM REDFORD MULOCK, F WINNIPEG, MANITOBA, CANADA.

PLATEN FOB TYPE-VVRITING MACHINES.

Application filed June 29, 1915.

To all whom it may concern:

Beflit known that 1, WILLIAM Rnnronn MULocK, a subject of the King of Great clearly illustrate the retaining rods and the Specification of Letters Patent.

Serial No. 37,066.

ment of the five-branch and four-branch pins 2n the surface of the platen. Figs. 6 and 4 are detailed perspective views of the fiveother Suitable substance. These plates 7 are Patented Get. 12, 1915.

Britain, residing at Winnipeg, in the Provbranch and four-branch pins. Fig. 8 is an 60 ince of Manitoba, CanadaQhave invented end view of a flatsurfaced platen embodycertain new and useful Improvements inmg my improvements. Fig. 9 is a broken Platens for Type-lVriting Machines, of front elevation of the device shown in Fig. which the following is a full, clear, and 8, and Fig. 10 is a detailed perspective View exactspecification. of a single pin which may be used instead 10 This invention relates to platens for typeof the multiple-branch pins, if desired.

writing machines and has for its object to Referringfirst to Figs. 1 to 7, inclusive, reduce the noise incident to the type striking the cylinder platen l is provided with a surthe platens. 7 face layer of soft rubber 2 in which small Two elements have been found to conmetal pins are embedded with their outer 15 tribute principally to producing the noise ends flush with the surface of said s'oft rubof the ordinary typewriting machine. One ber layer. The pins are preferably made of is the hardness of the platens and the other soft metal or other material or substance the size of said platens Lack of resiliency just hard enough to allow a clear impression also is responsible to a considerable degree, of the type being made on the paper. These although this is to a certain extent included pins are placed near enough togetherto inin the firstelement mentioned, namely, the sure every type striking one or more of hardness of the platens. them. For instance, the letter o'is indi- The present invention is based upon the cated in dotted lines in Fig. as striking hypothesis that if the type should strike the four of the pins. The diameter of the pins, 25 end of a thin rod of soft metal suspended in .While being quite small, is sufficient to prethe air instead of a large platen, the vulvent mutilating the paper, especially in view i canized surface of which is hard and resoof the close proximity of said pins to one I nant, the noise would be reduced almost to another. I .5 the point of imperceptibility, and the aim The pins are preferably formed four or of the invention is to produce a structure five on a single stem, as shown in Figs. 6 I which will carry out this theory in a pracand 7 and these groups .of four and five tical manner. pins to a stem are arranged alternately in I I The invention will be first hereinafter dehorizontal and vertical rows, as illustrated scribed in connection with the accompany in Figs. 1, 3 and 5, so as to space the i'ndi-- 5 ing drawings, which constitute a part of this vidual-pins equidistant apart. The'five pins specification, and then more specifically demountedon a single stem are designated 3 fined in the claims at the end of the descripin the drawings and the stem on which they M are mounted is indicated at a. The four In the accompanying drawings, wherein P s 1 a St m are designated 5 and their 4a similar reference characters are used to desstems 6. As illustrated in. Fig. l, the surf ce, ignate corresponding parts throughout the 0f the pla en ay be entirely covered with several views :F igure 1 is a broken side e pins, 35 the right hand end of the cylelevation of a cylinder platen constructed inder, or said pins may be arranged in. v substantially in accordance with this invenspaced longitudinal series, as shown on the 5 tion, one end portion having a different ar-v left hand end of'the cylinder. In the latter rangement of embedded pins or rods from case, the spacing of the series of pins is ac- {the other end portion. Fig. :2 is an end view cording to the usual spacing of the lines of nf the same. Fig. 3 is an enlarged section 'typewriting so that there will always be a 1 hikcn on the line III-III of Fig. 5, a porseriesor row of the pins below where the mm {lion also being shown in end elevationin type strike. I

tll'dfill to disclose the nuts on the ends of the The stems 4c and 6 of the pins are pro .tfaiiiiing rods. Fig. 4 is a broken section vided with plates secured thereto in transaiken on the line IV-IV of Fig. '3, to more verse relation and made of hard rubber or arranged between pairs of longitudinalrods r 55 nuts on their ends. Fig. 5. is'an enlarged I v 8 and 9 which extend through and proyect,

diagrarhrfiatic View showing the arrange layer 2. .Each pairof rods 8 is arranged}.

on the outer face of one of thejplates 7, one,

of said rods'b'eing at'either side'of the stem 3 nuts '01'1'their ends,.so thatthey' can 'rem'bv'ed rpa P 'P ,-etc.

' ilarly; arranged anaemic '2. A platen for typewriting machines, the platen having a surface layer of a resilient substance, material and embedded in said surface layer ofthepins, whileeach'pair of rods 9fis sintwith their ends flush with the outer surface on the inner face of one'o 'f said 'ilates.v All of the rodsare fitted with 1 Resiliency will be'caused by the plates on the pins resting on thelongitudinal'rods or resilient substancc, and spaced pins made wires 8 and 9, all of which are embedded in thesoft rubber lay'er, and this construe 1 tion will also greatly lessen the noise resulting' fromthe type striking the platen or "struck by thetype, said pins and their transverse plates are thrown inward toward the I center of the platen against the pairs of rods inal position where as hereinbefore stated, it-is obvious or wires 9 and also against the soft rubber in which these parts are embedded. Said rebound to their origthey will be held and maintained by the pairs of rods or wires 8 and the rubber which fills all the interstices between the pins, plates and rods, so that the ends of the pins will not project from the face of theplaten. The softrubber surface layer 2 is, of course, thicker than the pins are long, as shown in ig. 3, and will present a practically smooth surface.

-.Itisnot necessary to apply my improvement to a cylinder platen. Itmay' also be used on a flat surfaced platen orcase, as

pins will, therefore,

g illustrated in Figs. 8. and 9, the platenin this instance having a layer 20 of soft rubher in which pins 30 and 50 are embedded in the same manner as "already described in connection with the cylinder platen, and in which they are retained by longitudinal rods" or wires 80 and-90 similar to the rods 01' wires 8 and 9. When the fiat platen 11 is used, a pair of rollers 12 may be employed ior' guiding the paper 13 up over its sur ace.

While multiple-branch pins are preferred, that the pins may be made singly, as at 40 in Fig. 10, each of said pins being provided with a transverse plate corresponding to the plates 7 of the pins A and 6 for engagement with the wires or rods 8 and 9 in the same manner as illustrated in Figs. 3 and A. The construction will be the same with the single pins 70 except thatthere will be more of them than of the multiple-branch pins.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent of the United States is 1. A platen for typewriting machines, the platen having a surface layer of a resilient substance, and spaced pieces of harder ma- 'terial embedded in said surface layer with their outer faces flush with the outersurface pf said layer.

' surface layer,

'iembedded in said surface layer with their ends flush with the outer facethereof.

4. A platen having a surface layer of a harder material and embedded in said surface layer, said pins being disposed sub- \stantially at right angles, to the outer face paper placed over it. When the pins are,

pfl said surface layer and having their outer ends flush with such outer face. 7

5. A. platen for typ ewriting machines, the platen'having a surface layer of a resilient substance, and spaced-pieces of harder materialembedded in said surface layer with their outer faces flush with the outer surface of -'said layer, the size and spacing of said pieces being such that each type of the ma chine will necessarily strike at least one of said pieces.

6. A platen having a surface layer of resilient substance, pins embedded in said substance and'arranged substantially at right angles to the outer face of said surface layer, and imeans for preventing said pins from .being driven farther into said substance unand spaced pins made of a harderder' i'mpact' upon the outer face of said I outer layer. I

7. A platen having a surface layer of resilient substance, pins embeddedin said substance and arranged substantially at right angles to the outer face of said surface layer, and transverse plates on said pins also embedded in said substance for the purpose specified.

8. A platen having a" surface layer of resilient substance, pins' embedded in said substance and arranged substantially at right angles to the outer face of said surface layer, transverse plates-on said pins also embedded in said substance, forcing means in said substance. at either side of said plates for the purpose specified.

v9. A platen having a surface layer-of resilient substance, PlIlS embedded in". said substance and having their ends fiush'with the outer face of said surface layer, trans verse plates on said pins also embedded n saidsubstance, and longitudinal rods in said substance on the inner side of said plates,- from being driven plates on-said pins also embedded in said and longitudinal rods in said.

and reinsubstance on the outer and inner faces of the plates for the purpose specified.

11. A platen having a surface layer of resilient substance, pins embedded in said substance and having their ends flush with the outer surface of said substance, transverse plates on said pins also embedded in said surface-layer, and longitudinalrods in said substance and arranged in pairs, one

pair on the inner side and the otherpair 0nthe outer side of said-plates, the rods of each pair being arranged one at either side of the plus. a

l2. Agplaten. having a surface layer of resilient substance, pins embedded insaid substance and having their ends flush with the stance and having their ends flush with the outer surface of said surface layer, transverse plates on said p1ns also embedded in said surface layer, longitudinal rods extend-- ing through said substance and overlapping said plates, for the purpose specified, the

ends of said rods being threaded and projecting from the ends of the surface layer, and nuts on the ends of said rods.

14:. A platen having a surface layer of resilient substance, and pins embedded in said substance, said pins' being arranged in groups mounted on common stems.

15. A platen having a surface layer of resilient substance, and devices of harder materialembeddedin said substance, said devices comprising each'a stem and a plurality of branching pins, the latter having their ends-flush with the outer face of the surface layer;-

16. A platen having a surface layer of re silient substance, and devices of harder materiali embedded in said substance, said de-' vlcescomprising eacha stem and a plurality of'pins branching from said stem, said pins being flush- 'With the outer faceof the sur-i face layer and arranged equidistant apart in rows-stems with four and five nating in said rows.

In testimony whereof I have signed my name to this specification. l

WILLIAM REDFORDMULOCK.

pins alter- Copiea of this patent may he obtained for flve cents each, by addressing the Commissioner of Patents,

' Washington, D. G." 

